MVCC Organic Chemistry Crystallization Identification of Compound X Lab Report

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Moraine Valley Community College

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I need this done in about a day. The attachment below is the word document of the lab. Please send me it back in the same word document. Thank you very much. No Plagiarism.

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EXPERIMENT: CRYSTALLIZATION and IDENTIFICATION of COMPOUND X 20 Points 1. What is the purpose of crystallization? (1 point) 2. What type(s) of compounds can be recrystallized? Circle your answer. (1 point) A. B. C. D. E. Liquids Gases Solids Liquids and Solids Liquids, Solids and Gases 3. A student needs to perform a recrystallization on Compound X using one of the following solvents. Use the data below to help the student select a solvent for recrystallization. Which solvent should the student select? (1 point) Toluene or Ethyl Acetate or Water Solubility of X at 25 oC Solubility of X at 40 oC Toluene 5 mg/mL Toluene 7 mg/mL Ethyl Acetate 5 mg/mL Ethyl Acetate 60 mg/mL Water 210 mg/mL Water 220 mg/mL 4. Explain why the solvent you chose for Compound X is the best. Why are the other solvents not suitable? (2 points) 5. How would the purity of Compound X be impacted if some of the impure Compound X did not dissolve while the solution was heated during the recrystallization process? (1 point) 6. What would happen if too much solvent is used to dissolve impure Compound X? (2 points) 7. Why does the hot solution containing Compound X need to be cooled slowly? What will this prevent? (2 points) 8. Explain how the Compound X crystals are separated from the liquid solution. (2 points) 9. A student was provided with 2.56 g of a Compound X that was contaminated with an impurity. The student performed a crystallization to purify the compound and recovered 1.3 g of pure crystals. Calculate the percent recovery of pure Compound X from the impure sample. Show your work. (3 points) 10. Impure Compound X was found to have a melting point range of 106-114 oC. What do each of these numbers (104 and 112) represent? (2 points) 11. The purified Compound X was found to have a melting point of 112-114 oC. Was the purification successful? Explain how you know based on the melting point range. (2 points) 12. Compound X was narrowed to a list of six possible organic compounds. Determine the identity of compound X using the provided melting point data. (1 point) 3,4-Diaminotoluene 89-90 oC Acenaphthene 94-96 oC Isobutyranilide 106-107 Acetanilide 113-115 oC Benzoic acid 122-123 oC Urea 132-134 oC
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EXPERIMENT: CRYSTALLIZATION and IDENTIFICATION of COMPOUND X
20 Points
1. What is the purpose of crystallization? (1 point)
To purify organic or inorganic compounds by taking advantage of its solubility in a given solvent
at different temperatures. The impurities either stay dissolved or are easily decanted while the
compound slowly crystallize out of the solution.

2. What type(s) of compounds can be recrystallized? Circle your answer. (1 point)
A.
B.
C.
D.
E.

Liquids
Gases
Solids
Liquids and Solids
Liquids, Solids and Gases

3. A student needs to perform a recrystallization on Compound X using one of the
following solvents. Use the data below to help the student select a solvent for
recrystallization. Which solvent should the student select? (1 point)
Toluene

or

Ethyl Acetate

or

Water

Solubility of X at 25 oC

Solubility of X at 40 oC

Toluene 5 mg/mL

Toluene 7 mg/mL

Ethyl Acetate 5 mg/mL

Ethyl Acetate 60 mg/mL

Water 210 mg/mL

Water 220 mg/mL

4. Explain why the solvent you chose for Compound X is the best. Why are the other
solvents not suitable? (2 points)
The best solvent is that at which the solubility is very low at low temperatures but very soluble at
high temperatures. Toluene has a very low solubility at both low and high temperatures while
water has a high solubility at both. The ideal solvent is then ethyl acetate given that at low
temperature the solubility is just 5 mg/mL and at high temperatures it increases 12 times.

5. How would the purity of Compound X be impacted if some of the impure Compound X
did not dissolve while the solution was heated during the recrystallization process? (1
point)
It would be affected greatly since the pure compound X would begin to crystallize around the
impure crystals at lower temperatures. After heating it, the solution should not have any insoluble
particles.
6. What would happen if too much solvent is used to dissolve impure Compound X? (2...


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